Trek Multitrack, Giant Innova/Fargo, Univega, and Schwinn Criss cross, and Diamondback Overdrive etc are early 90's bikes with Cantilever brakes with road geometry, the Multitrack are a similar geometry to the bike you already have, they can accommodate some pretty wide tyres too. They make beautiful tourer's
Rear tyre clearance will be your first consideration when touring, wider tyres just carry weight better. Excuse the incompleteness of my bikes the are WIP's.
I started a Early 90's hybrid thread over in the hybrid section, you should check it out, the early 90's bikes are very nice to ride and should be cheaper than something 80's, people may disagree and that is fine.
Just my 2cents though.